16×20 Lean to Shed Roof Plans

This step by step diy project is about 16×20 lean to shed roof plans. This is PART 2 of the large shed plans, where I show you how to build the lean to roof. In order to build the roof, you need to use 2×10 lumber for the rafters and 3/4″ plywood for the roofing. Take a look over the rest of my woodworking plans, if you want to get more building inspiration.

When buying the lumber, you should select the planks with great care, making sure they are straight and without any visible flaws (cracks, knots, twists, decay). Investing in cedar or other weather resistant lumber is a good idea, as it will pay off on the long run. Use a spirit level to plumb and align the components, before inserting the galvanized screws, otherwise the project won’t have a symmetrical look. See all my Premium Plans HERE.

Projects made from these plans

16×20 Lean to Shed Roof Plans

Building-a-16×20-lean-to-shed

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• G – 2 pieces of  T1-11 siding – 48″x45″ long, 2 pieces – 48″x36″ long, 2 pieces – 48″x27″ long, 2 pieces – 48″x18″ long SIDING
• G – 2 pieces of 2×4 lumber – 25″ long, 2 pieces – 16 1/4″ long, 2 pieces – 2 1/4″ long SUPPORTS
• I – 16 pieces of 2×10 lumber – 220″ long RAFTERS
• J – 2 pieces of 2×10 lumber – 220″ long, 7 pieces – 8 1/4″ long 2xOVERHANG
• K – 4 pieces of 3/4″ plywood – 12″x96″ long, 2 pieces – 12″x28″ long, 8 pieces – 48″x96″ long, 4 pieces – 48″x48″ long, 2 pieces – 28″x96″ long, 1 piece – 28″x48″ long ROOF
• L – 2 pieces of 1×12 lumber – 220″ long, 2 pieces – 132 3/4″ long TRIMS
• M – 450 sq ft of tar paper, 450 sq ft of asphalt shingles ROOFING

• 3 pieces of T1-11 siding – 4’x8′
• 1 piece of 2×4 lumber – 8′
• 21 pieces of 2×10 lumber – 20′
• 14 pieces of 3/4″ plywood – 4’x8′
• 4 pieces of 1×12 lumber – 10′
• 4 pieces of 1×12 lumber – 12′
• 450 sq ft of tar paper, 450 sq ft of asphalt shingles
• tar paper
• rafter ties
• 6d nails, 2 1/2″ screws, 3 1/2″ screws
• wood filler , wood glue, stain/paint

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 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

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 One week

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• PART 1: 16×20 Lean to Shed Plans
• PART 2: 16×20 Lean to Shed Roof Plans
• PART 3: 16×20 Lean to Shed Door Plans

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16×20 Lean to Shed Roof Plans

Rafters

Next, you need to build the rafters for the 16×20 lean to shed. Mark the cut lines on the 2×10 boards and then get the job done with a saw. Smooth the edges with sandpaper so you get a professional result.

Fitting-the-rafters

Fit the rafters to the top of the shed structure, every 16″ on center. Use rafter ties to lock the trusses to the top plates tightly.

Side supports

Use 2×4 lumber for the side supports. Use a saw to make an angled cut at one end of the supports. Drill pocket holes at both ends of the supports and then secure them into place with 2 1/2″ screws. Make sure the corners are right-angled, for a professional result.

Lean to siding panels

Fit the T1-11 siding sheets to the side walls of the storage shed. Mark the cut lines on the sheets and get the job done with a saw. Use 6d nails, every 8″ along the framing.

Building the overhangs

Use 2×10 lumber for the side overhangs. You can adjust the size of these overhangs by making the blockings longer or shorter. Drill pilot holes through the beams and insert 3 1/2″ screws into the blockings.

Fitting the overhangs

Fit the overhangs to the sides of the of the shed. Align the edges with attention, drill pilot holes and insert 2 1/2″ screws to lock them into place tightly.

Fitting-the-roof-sheets

Cut the sheets for the roof from 3/4″ plywood and then fit them to the top of the shed. Align the edges with attention, drill pilot holes and insert 1 5/8″ screws, every 8″ along the rafters. Start installing the sheets from the bottom left up. Leave no gaps between the sheets.

Side roof trims

Use 1×12 lumber for the side roof trims. Align the edges with attention and insert 2 1/2″ screws to lock them into place tightly.

Front and back roof trims

Fit the 1×12 trims to the front and back of the roof. Align the edges with attention and then insert 2 1/2″ screws to lock them into place tightly.

Fitting the roofing

Cover the roof with tar paper and then install the asphalt shingles. Make sure you also install the appropriate drip edges, so you can seal the shed roof. Read the manufacturer’s instructions for a tight fit.

16×20 lean to shed plans free

Last but not least, you need to take care of the finishing touches. Fill the holes with wood putty and then smooth the surface with 120-220 grit sandpaper. Apply a few coats of paint or stain over the components to protect the shed from the weather elements and to enhance the look of the shed.

I have lots of other shed projects on the site so I recommend you to browse through all alternatives before starting the building project. See all my shed projects HERE. Moreover, check out PART 1 of the shed, so you learn how to build the frame of the shed. Check out PART 3 of the shed project, so you learn how to build the double doors.

This woodworking project was about 16×20 lean to shed roof plans free. If you want to see more outdoor plans, check out the rest of our step by step projects and follow the instructions to obtain a professional result.